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main.cpp
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main.cpp
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#include "mbed.h"
#include "main.h"
#include "sx1276-hal.h"
#include "debug.h"
/* Set this flag to '1' to display debug messages on the console */
#define DEBUG_MESSAGE 0
/* Set this flag to '1' to use the LoRa modulation or to '0' to use FSK modulation */
#define USE_MODEM_LORA 1
#define USE_MODEM_FSK !USE_MODEM_LORA
#define RF_FREQUENCY 920000000 // Hz
#define TX_OUTPUT_POWER 14 // 14 dBm
#if USE_MODEM_LORA == 1
#define LORA_BANDWIDTH 2 // [0: 125 kHz,
// 1: 250 kHz,
// 2: 500 kHz,
// 3: Reserved]
#define LORA_SPREADING_FACTOR 7 // [SF7..SF12]
#define LORA_CODINGRATE 1 // [1: 4/5,
// 2: 4/6,
// 3: 4/7,
// 4: 4/8]
#define LORA_PREAMBLE_LENGTH 8 // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT 5 // Symbols
#define LORA_FIX_LENGTH_PAYLOAD_ON false
#define LORA_FHSS_ENABLED false
#define LORA_NB_SYMB_HOP 4
#define LORA_IQ_INVERSION_ON false
#define LORA_CRC_ENABLED true
#elif USE_MODEM_FSK == 1
#define FSK_FDEV 25000 // Hz
#define FSK_DATARATE 19200 // bps
#define FSK_BANDWIDTH 50000 // Hz
#define FSK_AFC_BANDWIDTH 83333 // Hz
#define FSK_PREAMBLE_LENGTH 5 // Same for Tx and Rx
#define FSK_FIX_LENGTH_PAYLOAD_ON false
#define FSK_CRC_ENABLED true
#else
#error "Please define a modem in the compiler options."
#endif
#define RX_TRP_TIMEOUT 50000 // in us
#define RX_TIS_TIMEOUT 50000 // in us
#define BUFFER_SIZE 32 // Define the payload size here
DigitalOut led(LED1);
InterruptIn button(USER_BUTTON);
/*
* Global variables declarations
*/
typedef enum
{
IDLE,
RX,
RX_TIMEOUT,
RX_ERROR,
TX,
TX_TIMEOUT,
} AppStates_t;
typedef enum
{
NO_ACT,
TRP_REQ,
TRP_RESP,
TIS_REQ,
TIS_RESP,
} AppMode_t;
volatile AppStates_t State = IDLE;
/*!
* Radio events function pointer
*/
static RadioEvents_t RadioEvents;
/*
* Global variables declarations
*/
SX1276MB1xAS Radio( NULL );
uint16_t BufferSize = BUFFER_SIZE;
char Buffer[BUFFER_SIZE];
int16_t RssiValue = 0.0;
int8_t SnrValue = 0.0;
int32_t AccRssi;
int32_t AccSnr;
// Process State
AppMode_t Mode = NO_ACT;
int SID = '0';
uint16_t CurCount;
uint16_t EndCount;
uint32_t RxTimeout;
int SkipRx = 0;
static uint16_t GetDigit(char *p)
{
uint8_t i;
uint16_t v = 0;
for (i = 0; i < 3; i++)
v = v * 10 + p[i] - '0';
return v;
}
static void SendTRPReq()
{
debug("TRP_REQ %d %03d\r\n", SID, EndCount);
Buffer[0] = 'a';
Buffer[1] = SID;
sprintf(&Buffer[2], "%03d", EndCount);
Radio.Send((uint8_t*)Buffer, 2 + 3);
}
static void SendTRPResp()
{
debug_if(DEBUG_MESSAGE || CurCount+1 == EndCount, "TRP_RESP %d %03d (%03d)\r\n",
SID, CurCount, EndCount);
Buffer[0] = 'b';
Buffer[1] = SID;
sprintf(&Buffer[2], "%03d", CurCount++);
sprintf(&Buffer[5], "%03d", AccRssi * -1);
Radio.Send((uint8_t*)Buffer, 2 + 6);
}
static void SendTISReq()
{
debug_if(DEBUG_MESSAGE || CurCount == 0, "TIS_REQ %d %03d %03d\r\n",
SID, CurCount+1, EndCount);
Buffer[0] = 'c';
Buffer[1] = SID;
sprintf(&Buffer[2], "%03d%03d", CurCount++, EndCount);
Radio.Send((uint8_t*)Buffer, 2 + 6);
}
static void SendTISResp()
{
debug("TIS_RESP %d %03d (RSSI: %d, SNR:%d)\r\n", SID, CurCount,
AccRssi / CurCount, AccSnr / CurCount);
Buffer[0] = 'd';
Buffer[1] = SID;
sprintf(&Buffer[2], "%03d", CurCount);
sprintf(&Buffer[5], "%03d", AccRssi / CurCount * -1);
Radio.Send((uint8_t*)Buffer, 2 + 6);
}
static void GenSID()
{
if (++SID > '9')
SID = '1';
}
static void StartTRP(int count)
{
GenSID();
CurCount = 0;
EndCount = count;
Mode = TRP_REQ;
AccRssi = 0;
AccSnr = 0;
SendTRPReq();
}
static void StartTIS(int count)
{
GenSID();
CurCount = 0;
EndCount = count;
Mode = TIS_REQ;
AccRssi = 0;
AccSnr = 0;
SendTISReq();
}
static void ReportTRP()
{
debug("TRP Result: %d/%d (RSSI: %d, SNR: %d)\r\n", CurCount, EndCount,
AccRssi / CurCount, AccSnr / CurCount);
}
static void fire()
{
printf("Firing\r\n");
// StartTRP(100);
StartTIS(500);
}
static void RxProc()
{
uint16_t t;
if (BufferSize <= 0 || SkipRx) {
SkipRx = 0;
Radio.Rx(RxTimeout);
return;
}
switch (Buffer[0]) {
case 'a': // from master
Mode = TRP_RESP;
SID = Buffer[1];
CurCount = 0;
EndCount = GetDigit(&Buffer[2]);
AccRssi = RssiValue;
AccSnr = SnrValue;
debug("TRP Req: %c %d (RSSI:%d, SNR:%d)\r\n",
SID, EndCount, RssiValue, SnrValue);
SendTRPResp();
break;
case 'b': // from slave
if (Mode == TRP_REQ) {
CurCount++;
if (memcmp(&Buffer[2],
&Buffer[2 + 3], 3) == 0) {
// finished
ReportTRP();
Mode = NO_ACT;
RxTimeout = 0;
break;
}
} else {
RxTimeout = RX_TRP_TIMEOUT;
}
Radio.Rx(RxTimeout);
break;
case 'c': // from master
if (Mode != TIS_RESP || SID != Buffer[1]) {
SID = Buffer[1];
CurCount = 0;
Mode = TIS_RESP;
AccRssi = 0;
AccSnr = 0;
}
CurCount++;
AccRssi += RssiValue;
AccSnr += SnrValue;
t = GetDigit(&Buffer[2]);
EndCount = GetDigit(&Buffer[2] + 3);
//debug("TIS Req: %d/%d (RSSI:%d, SNR:%d)\r\n", t, EndCount, RssiValue, SnrValue);
if (t + 1 == EndCount) {
SendTISResp();
} else {
RxTimeout = RX_TRP_TIMEOUT;
Radio.Rx(RxTimeout);
}
break;
case 'd': // from slave
if (Mode == TIS_REQ) {
CurCount = GetDigit(&Buffer[2]);
debug("TIS Result: %d, %d (RSSI:%d, SNR:%d)\r\n", CurCount, EndCount, RssiValue, SnrValue);
Mode = NO_ACT;
StartTIS(100);
break;
}
RxTimeout = 0;
Radio.Rx(RxTimeout);
break;
default:
Radio.Rx(RxTimeout);
break;
}
}
static void TxProc()
{
switch (Mode) {
case TRP_REQ:
RxTimeout = RX_TRP_TIMEOUT;
Radio.Rx(RxTimeout);
break;
case TRP_RESP:
if (CurCount >= EndCount) {
// finished
Mode = NO_ACT;
RxTimeout = 0;
Radio.Rx(RxTimeout);
} else {
SendTRPResp();
}
break;
case TIS_REQ:
if (CurCount >= EndCount) {
// finished
RxTimeout = RX_TIS_TIMEOUT;
Radio.Rx(RxTimeout);
} else {
SendTISReq();
}
break;
case TIS_RESP:
Mode = NO_ACT;
RxTimeout = 0;
Radio.Rx(RxTimeout);
break;
default:
Radio.Rx(RxTimeout);
break;
}
}
int main()
{
debug("\r\nSX1276 PER Test Application\r\n");
button.rise(&fire);
// Initialize Radio driver
RadioEvents.TxDone = OnTxDone;
RadioEvents.RxDone = OnRxDone;
RadioEvents.RxError = OnRxError;
RadioEvents.TxTimeout = OnTxTimeout;
RadioEvents.RxTimeout = OnRxTimeout;
Radio.Init(&RadioEvents);
// verify the connection with the board
while (Radio.Read( REG_VERSION ) == 0x00) {
debug("Radio could not be detected!\r\n", NULL);
wait(1);
}
debug_if((DEBUG_MESSAGE & (Radio.DetectBoardType() == SX1276MB1LAS)) ,
"\r\n> Board Type: SX1276MB1LAS <\r\n" );
debug_if((DEBUG_MESSAGE & (Radio.DetectBoardType() == SX1276MB1MAS)) ,
"\r\n> Board Type: SX1276MB1MAS <\r\n" );
Radio.SetChannel(RF_FREQUENCY);
#if USE_MODEM_LORA == 1
debug_if(LORA_FHSS_ENABLED, "\r\n> LORA FHSS Mode <\r\n");
debug_if(!LORA_FHSS_ENABLED, "\r\n> LORA Mode <\r\n");
Radio.SetTxConfig(MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
LORA_SPREADING_FACTOR, LORA_CODINGRATE,
LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
LORA_IQ_INVERSION_ON, 2000000);
Radio.SetRxConfig(MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
LORA_IQ_INVERSION_ON, true);
#elif USE_MODEM_FSK == 1
debug("\r\n> FSK Mode <\r\n");
Radio.SetTxConfig(MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
FSK_DATARATE, 0,
FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
FSK_CRC_ENABLED, 0, 0, 0, 2000000);
Radio.SetRxConfig(MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, FSK_CRC_ENABLED,
0, 0, false, true);
#else
#error "Please define a modem in the compiler options."
#endif
debug_if(DEBUG_MESSAGE, "Starting PER loop\r\n");
led = 0;
Radio.Rx(0);
while (1) {
__disable_irq();
AppStates_t s = State;
State = IDLE;
__enable_irq();
switch (s) {
default:
case IDLE:
break;
case TX:
case TX_TIMEOUT:
TxProc();
break;
case RX:
RxProc();
break;
case RX_TIMEOUT: // only TIS_RESP
if (Mode == TRP_REQ) {
ReportTRP();
Mode = NO_ACT;
RxTimeout = 0;
} else if (Mode == TIS_RESP) {
SendTISResp();
break;
}
Radio.Rx(RxTimeout);
break;
case RX_ERROR:
Radio.Rx(RxTimeout);
break;
}
}
}
void OnTxDone(void)
{
Radio.Sleep();
State = TX;
debug_if(DEBUG_MESSAGE, "> OnTxDone\r\n");
}
void OnRxDone(uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
{
Radio.Sleep();
BufferSize = size;
memcpy(Buffer, payload, BufferSize);
RssiValue = rssi;
SnrValue = snr;
State = RX;
debug_if(DEBUG_MESSAGE, "> OnRxDone\r\n");
}
void OnTxTimeout(void)
{
Radio.Sleep();
State = TX_TIMEOUT;
debug_if(DEBUG_MESSAGE, "> OnTxTimeout\r\n");
}
void OnRxTimeout(void)
{
Radio.Sleep();
Buffer[BufferSize] = 0;
State = RX_TIMEOUT;
debug_if(DEBUG_MESSAGE, "> OnRxTimeout\r\n");
}
void OnRxError(void)
{
Radio.Sleep();
SkipRx = 1;
State = RX_ERROR;
debug_if(DEBUG_MESSAGE, "> OnRxError\r\n");
}